Truck concrete mixer



Oct. 15, 1935. G. JAEGER 2,017,064

wnucx CONCRETE MIXER Original Filed Nov. 50, 1928 5 sheets-she t 1 e w-l B N Us I I I |l| c: {D (D Z'mnentor GEBHARD JAEGER (Ittorneg J Oct. 15, 1935. G. JAEGER 2,017,064

TRUCK CONCRETE MIXER Original Filed Nov. 30, 19 3 Sheets-$heet 2 Inventor .GEBHARD JAEGER vim, W

Gttomeg 5 Oct. 15, 1935. JAEGER 2,017,064

TRUCK CONCRETE MIXER Original Filed Nov. 30, 1928 3 Sheets-Sheet 5 3nventor G EBHARD JAEGER (Ittomeg 5 Patented Oct. is, 1935 UNITED STATES PATENT OFFICE "TRUCK CONCRETE MIXER Gebhard Jaeger, Columbus, Ohio, assignor to The Jaeger Machine Company, Columbus, Ohio, a

-' corporation of Ohio 13 Claims.

This invention relates to a combined transporting and mixing truck for concrete and more especially for taking the unmixed materials of the .concrete from a point of supply and mixing them during transit to or at the point of deposit.

controlled by the meter to prevent discharge of the drum until the metering operation has been completed.

Another object of the invention is more especially to provide an improved and simplified mixing drum having a cylindrical portion terminat;

ing in a tapered discharge for a motor driven truck and means for mounting and rotating the same on a fixed horizontal axis on such truck whereby the concrete materials can be effectively mixed when the drum is rotated in one direction and the discharge of the materials caused by rotation of the drum in the opposite direction. Another object of the invention is the provision of improved means upon'such truck and drum that can be set to require or cause a predetermined number of mixing rotations of the drum to be effected before the rotation of the drum can be reversed to effect the discharge thereof. Other objectsof the invention will appear from the disclosure herein.

The invention is embodied in the example herein shown and described, the features of novelty being finally claimed.

In the accompanying drawings Figure 1 is a view in side elevation and partly in section and with some parts broken out and removed showing the truck mixer according to my invention.

Fig. 2 is a plan view of the chassis or truck frame containing the means for supporting and rotating the mixing drum.

Fig. 3 is a central longitudinal sectional view of the mixing drumshowing in full view my improved means for mixing the concrete material.

Fig. 4 is an elevation of the discharge and of the mixing drum.

Fig. 5 is a transverse section of the mixing drum on the line V-V Fig. 3.

Fig. 6 is a view like Fig. 4 showing a removable cover applied thereto.

Fig. 'i is a central vertical section on the line VIIVlI F18- 6.

Fig. 8 is a section like Fig. 7 showing a removable funnel substituted for the cover.

Fig. 9 is a view in side elevation with parts broken out and on a larger scale than exhibited in Fig. 1 showing the meter applied thereto.

Fig. 10 is a view in side elevation showing the meter mechanism.

Fig. 11 is a horizontal section on the line XI--X[ Fig. 10.

In the views l0 designates the truck, it consisting of any suitable niotor vehicle and containing an engine, the propeller shaft ll of which extends to a differential gear at the rear for driving the rear wheels, a clutch operated by a foot lever II, a gear shift lever ii for controlling the usual change speed and reversing gear in box l4.

In addition to these parts there is in the present construction a power take-off shaft l6 adapted to be operated from the crank shaft of the engine and gears in the box. In the present instance the power take-oil is geared to turn in one direction.

- 2| designates the mixing drum which is sup-' ported in rear of the drivers seat to rotate as hereinafter described on a forward pair of flanged 25 rollers l8 and rear pair of rollers l8, said rollers being journaled in stout saddles I9 and l9 respectively, secured transversely on the truck frame 20. Inthe example shown the drum 2| is mounted on its said supporting rollers with its axis parallel to the truck frame. The main body of the drum is cylindrical in form terminating at its rear in a tapered portion 2l= which is open for charging and discharging.

The forward end of the drum is closed and its rear open end may be provided with a movable cover 2|. bayonetly joined thereto to prevent accidental spilling of some of the contents. The drum is supplied with the dryconcrete materials to be mixed through the discharge and which may have attached to it for the purpose a funnel 22 secured in the same manner as the cover 2t The drum is provided with projecting peripheral track bands 23 and 23 to rest and travel on the rollers l8 and I 8 respectively; and because said rollers are flanged the drum is securely positioned thereon against longitudinal movement as respects the truck frame.

The forward end of the drum is provided with a. peripheral gear rack 25 engaged by a pinion 26 fixed on a shaft 26* journaled in suitable bearings on saddles between the truck'sills. Journaied in said saddles parallel to said shaft 26 is a shaft 21 having secured thereon a sprocket wheel 28 connected with a driven shaft by a sprocket wheel II fixed on the power take-off shaft l5. Loose on the shaft 25' is a sleeve 55 havin a clutch jaw at its rear end and a sprocket wheel on which is a sprocket chain ll driven by a sprocket chain 3| driven by a sprocket wheel fixed on the shaft 21; and also loose on said shaft 25 isa spur gear 32' having a hub provided with a clutch jaw at its forward end, and fixed on said shaft 2'| is a spur gear I! to engage the gear 3}. Slidable on said shaft 25' between said clutch jaws but splined to said shaft so as to rotate therewith is a double clutch 34 adapted to be slid into engagement with either of aforesaid clutch laws or to occupy a neutral or inactive position between them.

The double clutch has a'medial annular groove in which is received a lever 35 pivoted at 36 on the right hand truck sill, the free end of said lever being connected by a rod 31 with a hand lever 34 pivoted at 59 on the left hand truck sill so that said lever 35, if not otherwise prevented as hereinafter described, can beemployed to shift the double clutch to. engage one or the other of said clutch jaws or to occupy arneutral position. I

From the mechanism just described it will be plain that the spur gear 25, and therefore the mixing drum, can be driven bythe power shaft in one direction by shifting the double clutch to engage the clutch jaw of the sprocket wheel or in the opposite direction by shifting said double clutch toengage the clutch jaw of the spur gear, and that when the double clutch is left in the neutral position no rotation of the gear 26 or'the drum is effected notwithstanding constant operation of the engine of the power take-of! shaft and shaft 21 in one direction.

interior wall of the drum. These spiral blades are each arranged to move the material toward the forward or closed end of the drum when turned in one direction and conversely to move the material toward the rear or open end of the drum when turned in the opposite direction. Obviously the blades can be turned in the direction to move the material toward the rear with the closure closing the discharge opening so that by operating the drum in either direction or both directions successively a mixing effect is obtained. These blades, in the instance shown, in the cylindrical portion of the drum are of a width considerably less than half a radius of the drum but are of greatly increased width at 4| where they extend into the tapered end of the drum for the purpose of more stronglyimpelling the material in that portion of the drum forwardly in the drum when the concrete materials are being supplied thereto and prevent their escape through the discharge opening when the drum is turned in the mixing direction.

These wider portions of the blades not only accelerate charging operation but also accelerate the discharge of the materials from the drum when the rotation of the drum is reversed for said baflle blade onto the spiral blades and into the space between the spiral blades that are advancing the material forwardly. This inclined blade is supported at its rear 'corners by rods 43, 43, that cut through the material as it falls from s the rising side of the drum and thus aid in the mixing effect. Water can be supplied to the dry materials in the drum through a pipe 10 extending through a hole in the forward head of the drum at its axis.

The mechanism for compelling a predetermined number of mixing rotations of the drum prior to permitting discharging rotations includes a suitable housing 84 attached to the truck frame, said housing containing a central bearing at 84 on 1 which swings a meter actuator comprised of an arm 44 external of the housing adapted to be struck by a lug 45 on the rotating drum and an arm 45 within the housing carrying a pawl 41 adapted intermittently to feed clockwise a ratchet 2 'wheel 48 also mounted on said central bearing.

Also mounted on said central bearing carrying the ratchet wheel is a detent lever having arms 45 and 50 and connecting the arm 46 and the axis of the ratchet wheel is a volute coil spring 25 55' tending to turn the ratchet wheel anti-clockwise for the purpose of automatically restoring said wheel to its initial position.

Mounted to slide in holes in the opposite end walls of the housing is bar 5| provided with a 30 notch 52, its upper edge into which the arm 49 of the detent lever can be projected by a coil spring 53 to prevent the movement of said bar 5| to the right. The coil spring 53 being connected with said arm 49 and the rear wall of 35 the housing tends to hold said am engaged with said notch until positively released. As the ratchet wheel is fed clockwise by the rotation of the drum an adjustable arm 54 carried by that wheel eventually strikes the arm 50, removes the arm 0 49 of the detent lever from the notch 52 of the bar 5| as well as the feed pawl 41 and stop pawl 55 from the teeth of the wheel thereby permitting I the ratchet wheel to return under the influence of the coil spring 50 to its original or starting 45 position, such position being determined by the contact of an inwardly projecting pin 56 in the ratchet wheel with the internal arm 45. The arm 54 can be connected with any of a series of holes in the rim of the ratchet wheel so as to fix the 50 metering number of movements of said wheel. After a feed of the ratchet wheel by the pawl carrying arm 45 said pawl is restored to position for an additional feed by a coil spring 51 connecting the arm 44 with the rear wall of the housing.

The last described mechanism is somewhat similarto the mechanism shown in the patent of theUnited States issued to Joseph Eggert, December 3, 1929, No. 1,738,045.

Pivoted to the outer end of the bar 5| is an arm 58 having a beveled end 59 and two downward projections 50 and 6|, the former shorter than the latter. The beveled end of the bar 58 is supported in the slot of the bracket 58 fastened 05 to the truck sill. The arm 58 governs the movement of the clutch operating lever 35, the lug 6| preventing the reversal of the rotation of the drum until the predetermined number of the rotations thereof has taken place.

Normally the double clutch of the drum driving means stands in neutral position with the lever 35 between the lugs 60 and 5|. Upon the close of a metering operation the clutch operating lever 35 stands between the lugs 60 and BI, the 75 arm 55 having dropped by reason of its beveled end on the support 58- so that the lug 50 stands in the path of the lever 35. When, therefore, the lever 35 is drawn forward to engage the double clutch with the forward clutch jaw for metered mixing operations of the drum, the bar II and arm 58 are carried forward, the latter at the same time rising at its free end and permitting the detent arm 49 to engage said bars in the position indicated in Fig. 10' with the lever 35 slipping forward enough to lie under the lug ill. This insures firm retention of the detent by reason of the coiled retracting spring 1| connected with the arm and front cover of the meter housing. From this position the lever 35 can only be moved rearward far enough to put the double clutch in neutral position because obstructed by the projection 6|. In other words the clutch operating lever 35 is prevented from operation to effect the engagement of the double clutch with the drum reversing or discharging clutch jaw until the bar and arm 58 are released for rearward retraction by spring ll after the predetermined number of rotations of the drum in the mixing direction has taken place, this being effected by the release of the detent 49 by the contact of the end of the arm 54 with the lug of the arm 50. When the bar 5| and arm 58 have been thus retracted the double clutch can be moved rearward to bring about discharging rotations of the drum because the projection 5| has been removed from obstructing position. The releaseof the arm 50 is followed by the release of-the wheel feeding and holding pawls thereby permitting the return of the ratchet wheel and attached arm 54 under the influence of the volute spring 50' to its initial or starting position.

From the construction shown it is obvious that the mixing operation can be performed either while the vehicle is in transit or while standing still and while still it may be performed either at the point of supply of the unmixed material at intermediate points or at the point of deposit. In many instances it will be more advantageous to mix in transit so that the discharge may be made without delay.

The forms of the parts can be changed without departing from the gist of the invention as claimed.

This application is a division of an application for patent filed by me November 30, 1928, S. No. 322,640.

What I claim is:

1. In a motor truck concrete mixer, a rotatable mixing drum, power applying means for rotating said drum in mixing and discharging directions including a suitable clutch and a lever for operating the same, a metering device for the rotations of the drum in the mixing direction, and means controlled by the metering device including an arm provided with a stop to be engaged by movement of the clutch lever to cause the mi ing rotations, and a stop to prevent movement of the clutch lever to cause discharge operation of the drum until after said arm has been released by a predetermined number of revolutions of the drum.

2. In a motor truck concrete mixer, a rotatable mixing drum, power applying means for rotating said drum in mixing and discharging directions including a suitable clutch and a lever for operating the same, a metering device for the rotations of the drum in the mixing direction and means controlled by the metering device including an arm provided with a stop engaged by the of the drum in discharging direction.

by said lever to engage the clutch for mixing rotations of the drum.

3. In a concrete mixing machine, a mixing 10- drum, power applying means for rotating the drum, a reversing clutch means cooperating with the power applying means for causing rotation of the drum in one direction for the mixing operation and in the opposite direction for disl5 charging operation, a metering element for the mixing rotations of the drum, and means controlled by the metering element for preventing operation of the clutch meanstocause rotation 4. In a concrete mixing machine, a mixing drum, power applying means for rotating the drum, a reversing clutch cooperating with the power applying means for causing rotations of the drum in one direction for the mixing operation and in the opposite direction for the discharging operation, a clutch moving member, a metering element, means controlled by the metering element for preventing operation of the clutch moving member to discharging rotation of the mixing drum until the completion of the metering operation.

5. In a concrete mixing machine, a mixing drum, power applying means for rotating the drum, a reversing clutch means cooperating with the. power applying means for causing rotations of the drum in one direction for the mixing operation and in the opposite direction for the discharging operation, a metering mechanism, means controlled by the metering mechanism 40 for preventing movement of the clutch to cause mixing rotation of the drum until the metering element has been set for operation.

6. In a concrete mixing machine, a mixing drum, power applying means for rotating the drum, a reversing clutch means cooperating with the power applying means for causing rotations of the drum in one direction for the mixing operation and in the opposite direction for the discharging rotation, a clutch moving member, a metering element, means controlled by the metering element for preventing mixing rotation of the drum until the metering element has been set for operation, and means for preventing discharge rotations of the mixing drum until the completion of the metering operation.

'7. In a concrete mixing machine, a mixing drum power applying means for rotating the drum, reversing clutch means cooperating with the power applying means for causing rotation of the drum in one direction for the mixing operation and in the opposite direction for drum discharging operation, a metering element for the mixing rotations of the drum, means controlled by the metering element for preventing operation of the clutch means to cause rotations of the drum in discharging direction, means for simultaneously setting said metering element and engaging the clutch element for rotating the drum in mixing direction and means for preventing the operation of the clutch to cause discharging rotations during the metering operation.

8. In a concrete mixing machine, a mixing drum, power applying means for rotating the drum, reversing clutch means cooperating with the power applyingmeans for causing rotation of the drum in one direction for the mixing opwhen setting said metering element, and means on said arm for preventing the operation of the clutch to cause discharging rotations during the metering operation.

9. In combination, a truck mixer type of mixing machine, comprising a truck, a mixing drum thereon, an engine for rotating the drum, means to clutch the engine to the drum. to drive the drum for rotation, a batchmeter for governing the time during which a batch of aggregates should be mixed in the drum, and means for starting the batchmeter into operation controlled from said clutch means.

10. In combination, a truck mixer, including a power plant, a mixing drum, a discharge for said drum, a batchmeter adapted to govern the time when the discharge oi the drum should be operated, and means for operativeiy connecting the power plant to drive the drum in turn operatively connected "to the batchmeter to start said .batchmeter into operation.

11. In combination, a mixer for concrete, a motor to drive the mixer, a control device to drivingly connect the motor and mixer, an instrumentality ior causing discharge of the mixer, and means for controlling said instrumentality from the said control device.

12. Combined means as set forth in claim 11 in which the last means includes a timing mechanism that locks the said discharging instrumentality for a predetermined period 01' time. 15

13. In a truck concrete mixer, a mixing drum havinga charging and discharging opening, said drum adapted for mixing by rotation thereof in one direction and for discharging by rotation thereof in the opposite direction, power means for rotating the drum, a clutch forconnecting and disconnecting the power means to rotate the drum in either of said directions, a meter actuated by the rotation of the drum in the mixing direction, and means controlled by the meter to prevent operation of said clutch to cause discharge rotations of the drum until after the metering operation has been completed.

GEBHARD JAEGER. 

